Year	Percent
1993	24.57676
1994	24.91156
1995	15.59998
1996	18.41509
1997	18.90869
1998	8.71272
1999	11.12811
2000	8.95793
2001	6.78111
2002	14.0631
2003	19.97642
2004	46.53671
2005	41.38485
2006	32.7154
2007	45.74929
2008	13.73139
2009	18.9631
2010	21.42374
2011	15.24806
2012	19.46379
2013	24.78644
2014	30.06553
2015	24.42019
2016	32.96688